Elevator system



Jan. 31, 1939. R. B. TAYLOR 2,145,309

ELEVATOR SYSTEM Filed June 12, 1937 2 Sheets-Sheet 1 Pi .l.

g ONE FLOOR RUN HIGH SPEED RUN LEVELLIN; UNITS inventor I Haber- :9 B.Taylor, H s A i btorneg.

Jan. 31, 1939.

R. B. TAYLOR ELEVATOR SYSTEM Filed June 12, 1957 2 Sheets-Sheet 2 low",

wfim nB /w wb t r A .me .6 m H R Patented m. 31, 1 939 PATENT OFFICEELEVATOR sys'mm Robert B. Taylor, Schenectady, N. Y., assignor toGeneral Electric Company, a corporation of New York .Application June12, 1937, Serial No. 141,946

13 Claims.

My invention relates to elevator systems, more particularly to electricsystems of control for elevators and has for its object selectiveautomatic control means for decelerating and levelling the 5 elevatorfor low speed and high speed runs.

In carrying out my invention I utilize vacuum tube control means such asdisclosed in my U. S. Patent 1,910,190, dated May 23, 1933, and U. S.patent to John Eaton 1,910,204 of the same date. In the operation ofhigh-speed elevators it is desirable in making a stop from high speed tobegin the deceleration of the elevator some distance, perhaps one flooror more, ahead of the door at which the stop is to he made. For shortone floor runs, however, the elevator obviously does not have time toaccelerate to full speed and therefore the deceleration for the onefloor run for the most efllcient operation should not begin until theelevator is fairly close to the floor. In accordance with my invention Iprovide a special one floor run or low speed decelerating means withtime control means for causing this decelerating means to take controlfor one iioor runs.

For a more complete understanding of my in vention reference should behad to the accompanying drawings, Fig. l of which is a diagrammaticrepresentation of a system of elevator control embodying my invention,while Figs. 2 and 3 are diagrammatic views showing the control deviceson the elevator and in the hatchway.

Referring to the drawings, in the specific embodiment of my inventionshown, the elevator car H3 is raised and lowered by a main driving 3motor H which is connected in a Ward Leonard system with a generator i2driven at a substantially constant speed by means of a suitable drivingmotor (not shown). The motor and generator are connected together in apermanent electrical circuit which includes a series winding 53 for thegenerator and also a commutating winding it for the generator. The motorI l is con trolled by controlling the direction and degree ofenergization of a separately excited field winding 55 for the generatori 2 which held is connected to the direct current supply mains t6 and Hfor the desired direction of its excitation by means of reversingswitches 58 and I9 operated respectively by the coils and 2!. The degreeof excitation or strength of the motor field is controlled by suitablyconnecting resistances 22,

23, 24 and 25 in circuit with the field winding.

The control of the elevator is centered around' the manipulation of theresistances 12 to 25 inclusive in the circuit of the shunt fleld windingi5. During the starting and acceleration of the motor II, the fieldresistances are controlled by means of a suitable two-way car switch orcontroller 26 provided with a, handle 2! which is thrown to the left, asseen in the drawings. for operation of the elevator in a downwarddirection and to the right for the upward direction. Duringdeceleration, however, the resistances 22to 25 inclusive are controlledautomatically in response to the position or the car in the go hatchway,i. e., with respect to the floor to which the stop is to be made, so asto decelerate automatically the elevator at a uniform speed and at themaximum permissible rate without discomfort to the passengers. Thisposition respon- 15 sive deceleration control mechanism embodieselectron discharge control devices of the type disclosed in the abovementioned patents and therefore the devices themselves will be describedbut briefly herein. 20

Each device comprises an electric discharge device 26 of the threeelement type which is provided with a pair of coils 29 and 38 in itsoutput and input circuits respectively. 'ihese coils are mounted so asto be in mutual inductive relation with each other, although spacedapart somewhat, and thereby maintain the discharge devices normally inan oscillating condition. Under this oscillating condition a suitablerelay in the output circuit or the discharge device is in 30 effectdeenergized, the radio frequency oscillating current being bypassedthrough a condenser 3i and the direct current in the output circuit atthat time being very low in value as compared with the current requiredto operate the relay.

Seven of these deceleration control devices 32 to 33 inclusive areshown. The devices are mounted on the elevator in suitable positionssuch that as the elevator moves in the hatchway control vanes made of asuitable electrically conducting material, such as iron or copper,mounted in the hatchway adjacent each floor pass between the two coils29 and 38 of each device and temporarily interrupt the inductiveinter-linkage between the coils whereby the relay for the dischargedevice is operated to control the elevator.

In Figs. 2 and 3 the arrangement of the control devices withrespect tothe vanes is shown for a typical installation with the elevator levelledat a door. A levelling vane 39 is midway between the devices 36 and 38,the ends of the vane not being between the coils of each devicesufliciently to interrupt their omillatory condition. A shorter vane 43lies between the coils of the device 31 thus interrupting their os- '54and conductor 52 to main I6.

cillatory condition. The upward one floor run control device 32cooperates withthe vane 4| while the downward one floor run controldevice 33 cooperates with the vane 42. In a similar manner, the upwardhigh-speed control device 34 cooperates with the vane 43 and thedownward high-speed control device 35 cooperates with the vane 44. I

Assuming now that the elevator is to be started in a downwarddirection,the operation of the control mechanism for each point of the controller26 will be described in detail for the acceleration. Thereafter thedeceleration for high-speed runs and one floor runs and the levelling atthe floor will be described.

With the controller in the off position shown in the drawings and thesupply mains I6 and I1 energized, the coil 46 is energized, whereby theswitches 41 and 48 operated by it are respectively opened and closed.This circuit for the coil 46 leads from supply mains I1 throughconductor 49, switch 50, conductor 5|, the coil 46 and the conductor 52to the supply main I6.

Controller in first position on point 53 This energizes the coil 54 thecircuit for which is from the supply main I1 through conductor 49, thecontroller to point 53, conductor 55, coil The coil 54 opens theswitches 56 and 51, but no control function is performed at that time.

Controller in second position on point 58 In this position the coils 2|and 60 are energized in series with each other. This circuit may betraced from main I1 through conductor 49, the controller, conductor 6|,interlock switch 62, coil 2|, coil 60 and conductor 63 to main I6. Thecoil 2| closes the reversing switches I9 thus connecting the fieldwinding 55 across the supply mains in series with the resistances 22 and24 in parallel with each other. This circuit for the field winding I5leads from main I1 through conductor 49, resistance 22, the upper switchof reversing switch I9, the coil I5, the lower switch and conductor 63tomain I6. The circuit for the resistance 24 is from the main |1 throughthe switch 68, the conductor 69, the resistance 24 and conductor 10 tothe junction with resist ance 22. This energization of the field I5produces a low voltage in the generator I2 and the elevator starts atlow speed. The coil 60 has meanwhile closed the switch 50a whichenergizes the brake coil 10a to release the brake. The brake coilcircuit is from conductor 49 through coil 10a, switch 50a and conductor63 to main Also, the coil 60 opens the switch 50 thereby deenergizingthe coil 46 whereby the switch 41 closes and the switch 48 opens after apredetermined time interval determined by its timing device 48a. Itmight be noted briefly here that the switch 48 controls the one floorrun devices 32 and 33. Its timing device 48a is set to allow the switch48 to open in about 1 seconds. Consequently, if the controller 26 ismoved to the oil position within that period, which would be the casefor a one floor run, the one floor, run devices take control, as will bedescribed more in detail hereinafter.

At the same time the coil 2| opened its interlock switch 1| and closedits interlock switch 12 in the output circuit of the down one floor runthe down high speed control device 35, and also the interlock switches14, 15, 16 and 11.

Controller in third position on point 78 erator and the speed of theelevator is increased.

Also, the coil 19 closes its switch 83 thus completing a holding circuitfor the coil 2|, this circuit leading from main I1 through conductor 84,switch 83, conductor 85, switch 16, conductor 86, switch 62, coil 2|and, as before, through coil 60 and conductor 63 to main I6.

Likewise, coil 19 closes its switch 81 for its own holding circuit, thiscircuit leading from conductor 84 through switch 81, conductor 88,switch 89, conductor 90, switch .11, conductor 80, coil 19 and conductor8| to main I6.

Controller in fourth position on point 91 This closes the circuit forthe coil 92 leading from the controller through conductor 93, the coil92 and conductor 52 to main I6. The coil 92 closes its switch 94 thusconnecting the resistance 23 in parallel with the other threeresistances for higher elevator speed.

Also, the coil 92 closes its own interlock switch 95 whereby a holdingcircuit is established for coil 92 from main I1 through conductor 96,switch 91, switch 98, switch 93 and switch 15, conductor 93, coil 92 andconductor 52 to main I6 The coil 92 also closes an interlock switch 99in a circuit for the coil I00 as well as a switch IOI in the outputcircuit with the high-speed deceleration unit 35.

This circuit for the coil I00 is from main I1 through conductor 96,switches 91 and 98, switch 99, switch 14, conductor I02, coil I 00,switch I 04, switch I05 and conductor I06 to main I6.

The coil I00 is now energized provided the car speed is high enough toclose the switch I05 whose coil I08 is connected across the armature ofthe generator I2 and therefore responsive to its voltage and hence speedof the elevator. The

purpose of the switch I 05 is to prevent a too rapid acceleration of thecar in the event that the controller is moved immediately to the lastposition in contact with 9|. 1

Assuming that the switch I 05 is closed, the

. coil I00 is energized and closes its switch I09 Deceleration from fullspeed The controller 26 is thrown to its central 01! position but theelevator continues at full speed until the high-speed down vane 44 forthe next floor is reached by the down high-speed deceleration device 35.Because of the fact that the switch III is open the one floor devices 32and 33 are inactive, but the high-speed device 35, assuming downwardmovement, is rendered active by reason of the closing of the switch IOI.

Therefore, when the device 35 reaches the vane 44 (Fig. 3) its outputcircuit is energized sufiiciently to cause the relay coil II 2 to liftup its armature thereby opening the switch 91 in circuit of fieldwinding I5. The elevator now decelerates by regenerativebraking to apredetermined low speed such as 160 or 1'10 feet a minute.

The output circuit of the device may be traced from main I! throughconductor IIO,

switch 5-1, conductor II4, switch 41', coil 2,

switch IOI, switch I3, conductor II5, through the pliotron tube 6 andthence through the filament heating conductor I I! to the main I6.

At the same time or course the deenergization of the coil 92 opens theswitches 95, 99 and IN, the switch IOI deenergizing the coil II2. Also,the switch I I8 closes as well as the switch 91.

In the next decelerating operation the levelling devices take control.The first downward device 38 engages the vane 39 when the elevator isabout 24 inches from the floor whereby the coil H9 is energized andopens the switch 83, thereby deenergizing the coil 19 whose switch 82opens to disconnect the resistance 25. This leaves the resistances 22and 24 only in the field circuit whereby the speed is still furtherreduced.

Also, the deenergization of the coil 19 opens its switch 83, but thisdoes not deenergize the contactor coil 2i because of the closing of aholding switch I20 by the coil II9. Thus the circuit for the coil 2| isfrom main I'I through the switch I20, conductor I2I to the conductor 86and thence as before.

The tube control circuit for the relay coil II9 leads from main I!through conductor I I0, switch 51, conductor II4, switch H8, conductorI22, coil I I9 to the plate of the tube I23 and through the tube to thefilament heating circuit I I1.

As the elevator continues downward at still further reduced speed, thedeceleration unit 31 reaches the vane (Fig. 3). This preferably willoccur when the elevator is about eight inches from the floor. Itenergizes the coil I24 which opens the switch 68 to deenerglze theresistance 24 thus leaving the single resistance 22 in the fieldcircuit. As a result the elevator decelerates to a very low speed. Thecircuit of the coil I24 is the same as for the coil I I9 up to theconductor I22 from which it leads through the coil I24 to the plate ofthe tube I25 through the tube to the conductor II! and thence to themain I6.

The final control operation occurs when the device 38 leaves the vane 39whereby the coil H9 is deenergized and its switch I20 opened whereby thecoils 2i and 60 are deenergized. This opens the contactor I9 whereby thefield I5 is ,deenergized and opens the switch a whereby the brake coil10a is deenergized and the brake applied to stop the elevator at thefloor.

In the event that the elevator overruns the floor the upward levellingdevice 36 is activated whereby the coil I26 is energized and the switchI21 closed, whereby the coils 20 and are energized to reverse theelevator with the resistance 24 in the field circuit. This circuit forthe coils 20 and 60 leads from main I! through the conductor I28, switchI2I to the conductor I28a, switch II,

' and thence through the coils 20 and 60 to the conductor 63 and themain I6. When the elevator moves back at this very low speedsuiliciently to deenergize the coil I26, the field I5 is deenergized andthe brake again applied to stop the elevator accurately at the floor.

For onefioor runs the car switch is moved to the full running positionand then immediately returned to its central 03 position. As a'resultthe control circuits previously described are set 5 up with theexception of the energization of the coil I00 which is not energized byreason of the fact that the switch I04 is open. In other words, theaccelerating circuits are set up so that the car accelerates with allfour resistances 22 to 25 inclusive in the field circuit in parallelwith each other.

The coil J29 is at this time energized by reason of the fact thatthecoil 54 was deenergized and its switch 56 closed before the switch 48had timed open. Thus when the switch 56 closed, a circuit wasestablished for the coil I29 from main I! through conductor IIO, switch56, conductor I30,

switch 48, conductor I 3i, coil I29, conductor I32, switch 50a, nowclosed, and conductor 63 to the main I 6. The coil I29 closes itsswitchI33 and thus establishes a holding circuit for the coil I29 from main I1through conductor H0, switch 56, conductor I30, switch I33, conductorI3l to the coil I29 and thence as before to the main I6. Therefore, whenthe switch 48 opens after its predetermined time interval the coil I29is not deenergized.

At the same time, the coil I29 opens its interlock switch I04 and closesits interlock switch III in the output circuit of the one floor rundeceleration devices.

When the. device 33 reaches its vane 42 (Fig. 3) the coil I34 isenergized which opens the switch 98 and thereby deenergizes the coil92.. This opens the switch 94 leaving the three resistances 22, 24 and25 in the field circuit in parallel with each other. The elevator nowdecelerates and the deceleration is continuedby the levelling devices inaccordance with the preceding description in connection with the highspeed stop.

The circuit for the coil I34 is from the main I'I through conductor I I0, switch 51, switch III, coil I34, switch 12, conductor I34a, the tubeI35 and conductor III to main I6.

Long one floor run Provision is also made for runs for floors of greaterheight than the other floors. For such runs the car switch is centeredat once after being moved to the full running position. When thehigh-speed device 35 reaches its vane, however, the car will not havehad time to attain full speed and therefore should not be decelerated asfast as from full speed for eflicient operation.

The car accelerates with the samecontrol circuits as for a one floorrun, but has time to accelerate to a higher speed although not the maxi\mum speed. The coil I29 isnow energized as previously described. Whenthe high-speed device 35 reaches its vane the coil H2 is energized andcloses its switch i36 whereby the coil I3'I is energized and closes itsswitch I38 whereby a portion I39 of the resistance 23 is connected inparallel with the other three resistances this connection being throughthe conductor I40. The effect of this is to give increased generatorfield and delay the deceleration.

Also the coil II2 opens its switch 91 whereby coil 92 is deenergized andswitch I0l opened to deenergize coil H2. The switch I36 is thereforeopened very quickly after its closing whereby the coil I3! isdeenergized and switch I38 released. The switch I38 is a time operatedswitch and is set to open under the control of suitable timing for thecoil 5| as the first point in the downward direction. Thisis also trueoi the third and fourth points I and i. The interlock switches 6 to Iiiinclusive on the down contactor l8 select the proper down units 32 and34.

While I have shown a particular embodiment oi my invention, it will beunderstood, of course,

that I do not wish to be limited thereto since many modifications may bemade, and I therefore contemplate by the appended claims to cover anysuch modifications as fall within the true spirit and scope of myinvention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

l. A control system for elevators and the like comprising electricdriving means for the elevator, a controller for controlling saiddriving means to start and accelerate said elevator, a plurality ofmeans for controlling said driving means to decelerate said elevatorfrom respectively high and low speeds, said means being responsive tothe position or the elevator and said high-speedmeans being eflective ata greater distance from the desired stop, and means responsive tomovement of said controller for selectively rendering one 01' saiddecelerating means effective to decelerate said elevator.

2. A control system for elevators and the like comprising electricdriving means for the elevator, a manually operated controller forcontrolling said driving means to start and accelerate said elevator,low-speed and high-speed decelerating means for controlling said drivingmeans to decelerate said elevator, said decelerating means beingresponsive to the position of the elevator and said high-speeddecelerating means operating when the elevator is a greater distancefrom the floor than said low-speed decelerating means, and timecontrolled mechanism responsive to movement of said controller forrendering said low-speed decelerating means operative to decelerate saidelevator from a low speed.

3. A control system for elevators and the like comprising electricdriving means for the elevator, a manually operated controller forcontrolling said driving means to start and accelerate said elevator,low-speed and high-speed decelerating means for controlling said drivingmeans to decel erate said elevator, said decelerating means beingresponsive to the position of the elevator and said high-speeddecelerating means operating when the elevator is a greater distancefrom the floor than said low-speed decelerating means, and timecontrolled mechanism responsive to movement of said controller forrendering said low-speed decelerating means operative and for disablingsaid high-speed decelerating means to decelerate said elevator from alow speed.

4. A control system for elevators and the like, comprising thecombination with a hatchway and a car movable in said hatchway, electricdriving means for said car, reversing switches for controlling saiddriving means for forward and reverse operation, resistances in circuitwith said driving means for controlling the acceleration anddeceleration of said driving means, electromagnetically operated controlswitches for controlling said resistances, a controller for controllingsaid reversing and control switches to start and accelerate said car,low-speed and high-speed control devices for said control switchesmounted on said car, a pair of members mounted in said hatchway atdiiierent distances from the selected floor in position to come intocooperative relation respectively with said control devices and therebyoperate said control switches to control the decel-' and deceleration ofsaid driving means, electromagnetically operated control switches forcontrolling said resistances, a controller for controlling saidreversing and control switches to start and accelerate said car,low-speed and high-speed control devices for said control switchesmounted on said car, a pair of members mounted in said hatchway atdiiferent distances from the selected floor in position to come intocooperative relation respectively with said control devices and therebyoperate said control switches to control the deceleration of said car,the member for said low-speed control device being nearer the floor,means normally disabling said low-speed control device, and timecontrolled means responsive to movement of said controller to its oflposition for rendering eflectlve said low-speed control device.

6. A control system for elevators and the like, comprising thecombination with a hatchway and a car movable in said hatchway, electricdriving means for said car, reversing switches for controlling saiddriving means for forward and reverse operation, speed control means forcontrolling the acceleration and deceleration of said driving means,eiectromagnetically operated control switches for controlling speedcontrol means, a manually operated controller for controlling saidreversing and control -switches to start and accelerate said car,low-speed and high-speed electron discharge devices having input andoutput circuits mounted on said car, a pair of devices mounted in saidhatchway at different distances from the selected floor in position tocome into cooperative relation respectively with saiddischarge devicesand thereby control said out put circuits, the device for said low-speeddischarge device being nearer the floor, means included in said outputcircuits for operating said control switches to control said speedcontrol means and thereby control the deceleration of said car, meansnormally disabling said lowspeed discharge device, and time controlledmeans responsive to movement of said controller for rendering effectivesaid low-speed discharge device.

7. A control system for elevators and the like,

comprising the combination with a hatchway and a car movable in saidhatchway, electric driving means for said car, reversing switches forcontrolling said driving means for forward and rein said hatchway atdifferent distances from the.

selected fioor in position to comeinto cooperative relation respectivelywith said discharge devices upon movement of said car and therebycontrol said output circuits, the vane for said low-speed dischargedevice being nearer the floor, means included in said output circuitsfor operating said control switches to vary the amount of resistance insaid circuit to control the deceleration of said car, means normallydisabling said low-speed discharge device, and time controlled meansresponsive to movement of said controller to its off position forrendering effective said low-speed discharge device and for disablingsaid high-speed discharge device.

8. A control system for elevators and the like, comprising electricdriving means for the elevator, a manually operated controller providedwith a plurality of positions for controlling said driving means tostart and accelerate said elevator, decelerating means for controllingsaid driving means to decelerate said elevator, said decelerating meansbeing responsive to the position of the elevator, a normally open switchin a control circuit for said decelerating means, means operated by saidcontroller when in one position for closing said switch, means actuatedby movement of said controller to a second position for opening a secondswitch in said control circuit, means actuated by movement of saidcontroller to a third pos'tion for releasing said first switch and forclosing a third switch in said control circuit, time responsive meansfor delaying the opening of said first switch for a predetermined timeinterval, and means actuated by movement of said controller to a finalposition for holding said third switch closed when said controller isreturned to said one position, whereby when said controller is returnedto said one position before said first switch has opened, said secondswitch closes to energize said decelerating means for deceleration ofsaid elevator from a low running 9. A control system for elevators andthe like, comprising electric driving means for the elevator, a manuallyoperated controller provided with a plurality of positions forcontrolling said driving means to start and accelerate said elevator,decelerating means for controlling said driving means to decelerate saidelevator, said decelerating means being responsive to the position ofthe elevator, a normally open switch in a control circuit for saiddecelerating means, means operated by said controller when in oneposition for closing said switch, means actuated by movement of saidcontroller to a second position for opening a second switch in saidcontrol circuit, means actuated by movement of said controller to athird position for releasing said first switch and for closing a thirdswitch in said contrcl circuit, time responsive means for delaying theopening of said first switch for a predetermined time interval, meansactuated by movement of said controller to a final position for holdingsaid third switch closed when said controller is returned to said oneposition, whereby when said controller is returned to said one position,before said first switch-has opened, said second switch closes toenergize said decelerating means for deceleration of said elevator froma low running speed, and decelerating and levelling control means forsaid driving means responsive to the position of the elevator fordecelerating and levelling the elevator and for thereafter openingsaidthird switch.

10. A control system for elevators and the like, comprising electricdriving means for the elevator, a. manually operated controller providedwith a plurality of positions for controlling said driving means tostart and accelerate said elevator, decelerating means for controllingsaid driving means to decelerate said elevator, said desaid controlleris in one position, means operated by movement of said controller toanother position for opening a second switch in said control circuit,means operated by movement of said controller to a third position fordeenergizing said first switch and for closing a third switch in saidcontrol circuit, time responsive means for delaying the opening of saidfirst switch, and means operated by movement of said controller to afinal position for establishing a circuit to maintain said third switchclosed when said controller is returned to said one position, wherebywhen said controller is returned to said one position before said firstswitch has opened, said second switch closes to energize saiddecelerating means for deceleration ofsaid elevator from. a low runningspeed.

ll. A control system for elevators and the like, comprising electricdriving means for the elevator, a manually operated controller providedwith a plurality of positions for controlling said driving means tostart and accelerate said elevator, decelerating means for controllingsaid driving means to decelerate said elevator, said decelerating meansbeing responsive to the position of the elevator, a first normallyclosed switch for closing a circuit when the controller is in its offposition, to close a second switch in a control circuit for saiddecelerating means, means operated by movement of said controller to afirst position for opening a third switch in said control circuit, meansoperated by movement of said controller to a second position for openingsaid first switch to deenergize said second switch and for closing afourth switch in said control circuit, time responsive means fordelaying the opening of said second switch, and means operated bymovement of said controller to a final position for establishing aholding circuit to maintain said first and fourth switches respectivelyopen and closed when said controller is returned to its oil position,whereby when said controller is returned to its oil position before saidsecond switch has opened, said third switch closes to energize saidlow-speed decelerating means for deceleration of said elevator from alow running speed.

12. A control system for elevators and the like, comprising electricdriving means for the elevator, a. manually operated controller providedwith a. plurality of positions for controlling said driving means tostart and accelerate said elevator, low-speed and high-speeddecelerating means for controlling said driving means to decelerate saidis a greater distance from the floor than said lowspeed deceleratingmeans, a first normally closed switch for closing a circuit when thecontroller circuit to maintain said is in its oil position to close asecond switch in a 'control circuit for said low-speed deceleratingmeans, means operated by movement of said controller to a first positionfor opening a third switch in said control circuit, means operated, bymovement of said controller to a second position .ior opening said firstswitch to deenergize said second switch. and for closing a fourth switchin said control circuit, time responsive means for delaying the openingof said second switch, and means operated by movement of said controllerto a final position for establishing a holding first and fourth switchesrespectively open and closed when said controller is returned to its 01!position, whereby when said controller is returned to its off positionbefore said second switch has opened, said third switch closes toenergize said low-speed decelerating means for deceleration of saidelevator from a low running speed.

13, A control system for elevators and the like, comprising electricdriving means for the elevator, a manually operated controller providedwith a plurality of positions for controlling said driving means tostart and accelerate said elevator, low-speed and high-speeddecelerating means for controlling said driving means to decelerate saidelevator, said decelerating means vtroller to a first position for beingresponsive to the position so: the elevator and said high-speeddecelerating means operating when the ear is a greater distance from thefioor than said low-speed decelerating means, a first normally closedswitch for closing a circuit when the controller is in its off positionto open a second switch to deenergize said high-speed decelerating meansand to close a third switch in a control circuit for said low-speeddecelerating means, means operated by movement of said conopening afourth switch in said control circuit, means operated by movement ofsaid controller to a second position for opening said first switch todeenergize said second and third switches and for closing a fifth switchin said control circuit, time responsive means for delaying the openingof said second and third switches, means operated by movement of saidcontroller to a final position for estab-' lishing a holding circuit tomaintain said first and fifth switches respectively open and closed whensaid controller is returned to its oil? position whereby when saidcontroller is returned to its off position before said second and thirdswitches have closed and opened, said fourth switch closes to energizesaid low-speed decelerating means for deceleration of said elevatorfrom. a low running speed, and time controlled means operated by saidhigh-speed decelerating means after energization of said low-speeddecelerating means for decreasing temporarily the rate of decelerationof said elevator.

ROBERT B. TAYLOR.

